THE RESPIRATORY SYSTEM

What is respiration?

• The movement of oxygen from the outside environment to the cells within tissues

• The removal of carbon dioxide and other waste products from the tissues

• The way that energy is released from glucose in living cells

• The movement of air through the respiratory system

What is the composition of inhaled air?

• 20% oxygen and 4% carbon dioxide

• 16% oxygen and 4% carbon dioxide

• 79% nitrogen and 20% oxygen

• 20% oxygen and four hundredths of 1% carbon dioxide

What are the tiny passageways that lead to the air sacs in the lungs called?

• Alveoli

• Bronchioles

• Trachea

• Bronchi

What is the normal respiratory rate for an adult at rest?

• 12 to 20 breaths per minute

• 20 to 25 breaths per minute

• 6 to 12 breaths per minute

• Over 25 breaths per minute

What happens to the respiratory rate when a person engages in physical activity?

• It stays the same

• It decreases

• It increases

• It becomes irregular

Exhaled air consists of approximately 4% oxygen and 16 % carbon dioxide.

• true

• false

Nitrogen which makes up about 79% of the atmosphere is not involved in the breathing process.

• true

• false

The respiratory tract is lined with the layer of mucus constantly moved by cilia.

• true

• false

Any muscular effort, for example, even standing up, decreases the number of breaths.

• true

• false

Interruption of breathing for only a few minutes by suffocation or strangulation causes death.

• true

• false